Well you dont really want to do it in any other gear than 2nd, and i think it does account for drag somehow since its listed. My only problem is i dont know the weight of the car so i just put in 3700 + 200lb driver. This was also on a very flat nebraska road. I have also checked my HUD speedo vs one of those radar speed signs and its pretty spot on.

Its really more of a toy or a comparison for big mods, i.e. changing power adder, maybe cam or something. If you put it on 0 smoothing it just looks awful. Thats why i did 3 back to back runs to see how consistent it was, but whos to say that wasnt just my car.